From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.11]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CC5B63D413C; Tue, 20 Jan 2026 08:17:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.11 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768897071; cv=none; b=gvLLkhDAa2EwzNekn37Tiw4HIChZz+3f+MisxU8tt1cT0IK/PC7Hb1OJ+C995mol5r9T8Ec13bBjm1tNYaBApGgO8+wdd3k5mjmjlEOuBjJsFSIW7gSJiH2+MOKP1gkJnvnZZzJE7OZXmuiRXRYkY3r9xssKq7Zu1Cqgz166LIQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768897071; c=relaxed/simple; bh=Xfijze/X4OkStQQaLtiCDwYKY/ckpnZZcmbaC0E09Ks=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=mO7UKi3q9Ay/NUWHIN7AENYkj/3tfW+71wRvgzULczPHCa+YgS7QZDMOLgz22WVXpN7zQxhIU165rGZXmPUbaTL/FJZHKy1n6xTEbdguiyG+5SBVVIMzyWgK9ieKDOoAcoXl5+AUE+TZFPQGNZrxQ4OtiGt7UDLv9OMsTD4m42s= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=UiFjWcNa; arc=none smtp.client-ip=192.198.163.11 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="UiFjWcNa" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1768897070; x=1800433070; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=Xfijze/X4OkStQQaLtiCDwYKY/ckpnZZcmbaC0E09Ks=; b=UiFjWcNajLRbWt6BBQNRxA/y9+H0L5L5l+re7msI4I+OaZcSSKJXe0pf VUQ+HAJ5LDg+lR+ODvxK2AvaEESHuHXervQ6nNYQ9gk6fIdZEYMaTR+sw B2mZ+g7h9jb9H0U8DyjGQGjK2nAp1BYtqKenSWmlodRGaMSdSr1KIIjYv EKtoEIFpcHZuf5ccMkoFTxPrpkDhWevlNC12VSWgTMPRIn3/Rvo61FQ4a 7oxlubMKGsY/c7Uol9gI6xqKFE7DfAPkCFFZNIlqr8NosHFmlPByj5c0y DoIpYjp9KshTyYuOX16553nj3bI40gRqqvSFwO76ROvj4HEWbLoNcwWe6 A==; X-CSE-ConnectionGUID: AHMaWr2+ROGlYophiOicMg== X-CSE-MsgGUID: pKIU1SZeQ/S/F54J3gvGxA== X-IronPort-AV: E=McAfee;i="6800,10657,11676"; a="80732089" X-IronPort-AV: E=Sophos;i="6.21,240,1763452800"; d="scan'208";a="80732089" Received: from fmviesa006.fm.intel.com ([10.60.135.146]) by fmvoesa105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Jan 2026 00:17:49 -0800 X-CSE-ConnectionGUID: b67ww9DYRQ+U7Lww9Na7Gg== X-CSE-MsgGUID: keYR13a4SjSIRYKWOqq3jQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.21,240,1763452800"; d="scan'208";a="205965634" Received: from lkp-server01.sh.intel.com (HELO 765f4a05e27f) ([10.239.97.150]) by fmviesa006.fm.intel.com with ESMTP; 20 Jan 2026 00:17:47 -0800 Received: from kbuild by 765f4a05e27f with local (Exim 4.98.2) (envelope-from ) id 1vi6vp-00000000Oih-11Zb; Tue, 20 Jan 2026 08:17:45 +0000 Date: Tue, 20 Jan 2026 16:17:05 +0800 From: kernel test robot To: "Masami Hiramatsu (Google)" , Steven Rostedt Cc: oe-kbuild-all@lists.linux.dev, Masami Hiramatsu , Mathieu Desnoyers , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Subject: Re: [PATCH v4 2/4] tracing: Make the backup instance non-reusable Message-ID: <202601201531.ng4kqZhn-lkp@intel.com> References: <176887137556.578403.17994205756247311821.stgit@mhiramat.tok.corp.google.com> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <176887137556.578403.17994205756247311821.stgit@mhiramat.tok.corp.google.com> Hi Masami, kernel test robot noticed the following build warnings: [auto build test WARNING on trace/for-next] [also build test WARNING on linus/master v6.19-rc6 next-20260119] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Masami-Hiramatsu-Google/tracing-Reset-last_boot_info-if-ring-buffer-is-reset/20260120-091429 base: https://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace for-next patch link: https://lore.kernel.org/r/176887137556.578403.17994205756247311821.stgit%40mhiramat.tok.corp.google.com patch subject: [PATCH v4 2/4] tracing: Make the backup instance non-reusable config: arc-defconfig (https://download.01.org/0day-ci/archive/20260120/202601201531.ng4kqZhn-lkp@intel.com/config) compiler: arc-linux-gcc (GCC) 15.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260120/202601201531.ng4kqZhn-lkp@intel.com/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-kbuild-all/202601201531.ng4kqZhn-lkp@intel.com/ All warnings (new ones prefixed by >>): kernel/trace/trace.c: In function 'tracing_init_tracefs_percpu': >> kernel/trace/trace.c:9398:17: warning: variable 'writable_mode' set but not used [-Wunused-but-set-variable] 9398 | umode_t writable_mode = TRACE_MODE_WRITE; | ^~~~~~~~~~~~~ vim +/writable_mode +9398 kernel/trace/trace.c 9393 9394 static void 9395 tracing_init_tracefs_percpu(struct trace_array *tr, long cpu) 9396 { 9397 struct dentry *d_percpu = tracing_dentry_percpu(tr, cpu); > 9398 umode_t writable_mode = TRACE_MODE_WRITE; 9399 struct dentry *d_cpu; 9400 char cpu_dir[30]; /* 30 characters should be more than enough */ 9401 9402 if (!d_percpu) 9403 return; 9404 9405 if (trace_array_is_readonly(tr)) 9406 writable_mode = TRACE_MODE_READ; 9407 9408 snprintf(cpu_dir, 30, "cpu%ld", cpu); 9409 d_cpu = tracefs_create_dir(cpu_dir, d_percpu); 9410 if (!d_cpu) { 9411 pr_warn("Could not create tracefs '%s' entry\n", cpu_dir); 9412 return; 9413 } 9414 9415 /* per cpu trace_pipe */ 9416 trace_create_cpu_file("trace_pipe", TRACE_MODE_READ, d_cpu, 9417 tr, cpu, &tracing_pipe_fops); 9418 9419 /* per cpu trace */ 9420 trace_create_cpu_file("trace", TRACE_MODE_WRITE, d_cpu, 9421 tr, cpu, &tracing_fops); 9422 9423 trace_create_cpu_file("trace_pipe_raw", TRACE_MODE_READ, d_cpu, 9424 tr, cpu, &tracing_buffers_fops); 9425 9426 trace_create_cpu_file("stats", TRACE_MODE_READ, d_cpu, 9427 tr, cpu, &tracing_stats_fops); 9428 9429 trace_create_cpu_file("buffer_size_kb", TRACE_MODE_READ, d_cpu, 9430 tr, cpu, &tracing_entries_fops); 9431 9432 if (tr->range_addr_start) 9433 trace_create_cpu_file("buffer_meta", TRACE_MODE_READ, d_cpu, 9434 tr, cpu, &tracing_buffer_meta_fops); 9435 #ifdef CONFIG_TRACER_SNAPSHOT 9436 if (!tr->range_addr_start) { 9437 trace_create_cpu_file("snapshot", TRACE_MODE_WRITE, d_cpu, 9438 tr, cpu, &snapshot_fops); 9439 9440 trace_create_cpu_file("snapshot_raw", TRACE_MODE_READ, d_cpu, 9441 tr, cpu, &snapshot_raw_fops); 9442 } 9443 #endif 9444 } 9445 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki